Paper-making apparatus



July 29, 1 24- 1,503,246

(3. G. ROBINSON PAPER MAKING APPARATUS il 24 1919 2 Sheets-Sheet 1 l dig 3 mac "to-r,

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attain C. G. ROBINSON PAPER MAKING APPARATUS Filed Nov. 24, 1919 2 Sheets-Sheet 2 a vwe n 01,

Patented July 29, 1924.

UNITED STATES PATENT OFFICE.

CHARLES G. ROBINSON, OF BUFFALO, NEW YORK, ASSIGNOR, BY MESNE ASSIGN- MENTS, TO THE BEAVER PRODUCTS COMPANY, INC, A CORPORATION OF NEW YORK.

PAPER-MAKING- APPARATUS.

Application filed November 24, 1919. Serial No. 840,296.

To all whom it may concern:

Be it known that I, CHARLES G. ROBIN- SON, a citizen of the United States, residing at 183 Highland Avenue, Bufi'alo, in the county of Erie, State of New York, have invented certain new and useful Improvements in Paper-Making Apparatus; and I do hereby declare the following to be a full, clear, and exact description of the inven- *tion, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to improvementsv in the manufacture of paper and involves an improved apparatus of the duplex type in which a common drying element is 0peratively associated with two independent instrumentalities for simultaneously forming two webs of paper from appropriate paper pulp stock.

In its general aspect, the invention contemplates a duplex machine or apparatus which is adapted to simultaneously roduce two independent sheets or webs 0 paper. Thus, the improved apparatus of the invention comprises a complete paper maklng machine of the ordinary type in combination with the wet or forming end of a similar paper making machine, the latter being arranged t utilize the drying element of the first paper making machine. In general, the complete paper making machine is constructed and arranged in accordance with the usual present day practice, and with this machine is combined the wet or forming end of a second paper making machine. In practice, I find it convenient to arrange the second wet or forming and of the duplex apparatus at a higher level than the other wet or forming end of the apparatus, for example, on the floor above. The two wet or forming ends of the duplex apparatus are arranged to deliver the formed Webs of paper to the drying element. From the drying element simultaneously of the duplex apparatus, the two sheets or dried webs of aper are conducted to independent calen ers and from the respective calenders to winders, slitters, rewinders or other appropriate finishing elements.

The novel features of the invention which I believe to be patentably characteristic thereof are set forth in the appended claim. The construction and mode of 0 eration of the improved apparatus of t c invention will be better understood from the following description taken in conjunction with the accompanying drawings, in which Fig. 1 diagrammatically illustrates two wet ends or web-forming devices for formmg webs of paper from appropriate paper Stock; and

Fig. 2 diagrammatically illustrates the common drying and finishing elements of the duplex apparatus.

It will be understood that F i 2 of the accompanying drawings is in e ect a continuation of Fig. 1, so that Fig. 1 is the left hand portion of the improved duplex apparatus and Fig. 2 is the remainder or right-hand end f the duplex apparatus.

Referring now more particularly to the accompanying drawings, I have designated by reference character A the wet or forming end of an ordinary paper making ma chine and by reference character B the wet or forming end of a similar paper making machine and by reference character C the drying element of an ordinary paper making machine. The wet end A and the drying element C, together with the appropriate calenders, form in combination a paper making machine of the ordinary type, while the wet end B and the drying element C, together with the appropriate calenders, form in combination a similar wet paper making machine of the ordinary type. In accordance with my preferred practice, the two wet or forming ends A and B are arranged one above the other, for example, on the first andsecond floors of the building in which the duplex apparatus is lo ,cated.

The wet or forming ends A and of the duplex apparatus comp-rise approprlate 1nstrumentalities for forming a web of paper from suitable paper pulp stock. In genthe web of pul the wet-ends A and B of the duplex apparatus comprises a series of pulp vats 10 within which are mounted screen cylinders 11 of the usual type. The pulp within the vats is maintained at the desired level, as well understood in the art, so that the cylinders 11 will be immersed therein to the desired extent. The water passing into the interior of the cylinders 11 is withdrawn therefrom in amanner well understood in the art and accordingly not herein illustrated and described. As, the cylinders 11 rotate, a layer of pulp is formed thereon, the thickness of the pulp layer being regulatedby the difl'erence in level between the pulp and the water within the cylinder. Arranged above each cylinder 11 is a couch roll 12carried by a pivotally supported frame member 13. The distance or space between the co-operating couch rolls 12 and cylinders 11 may be appropriately adjusted by means of a hand wheel 14 and cooperating link 15.

The paper making machine has a lower felt or blanket 16 and an upper felt or blanket 17. These blankets are of the usual endless type and appropriate guide rolls and the like are provided in conjunction therewith, as well understood in the art. The lower blanket 16 passes over the cylinders 11, and the layer of pulp formed upon each cylinder is brought into contact with the blanket as the cylinder rotates and is removed from the cylinder by the blanket which carries it through the machine in the well understood manner.

The second felt or blanket 17 comes in contact. with the la er or web of pulp adhering to the lower lanket 16 at the first of a series of ringer rolls 18, so that the layer of pulp is in contact with both the upper and lower blankets when passing through the ringer rolls 18. These rolls serve to remove a portion of the water from the pulp web. From the last of the ringer rolls 18, the web of pulp enclosed between the lower and upper blankets 16 and 17 respectively, passes ownwardly to a series of press rolls 19 between which it is subjected to a heavy pressure, so that a large portion of the water is squeezed out of the pulp web. After passing) through the last press roll 19, the up er lanket 17 is separated from the pulp we and the lower blanket 16 and adhering pulp web pass through the first of a series of presses 20. After passing through the first press 20 of the series, the lower lanket 16 is separated from the ulp web, and the pulp web then passes t rogh the remainmg presses of the series.

Referring now more particularly to Fig. 2 of the drawings, it Wlll be observed that coming from the fourth press or press ro ls of either of the wet ends A or B of the paper making apparatus passes through suitable guide and press rolls 21 and thence into the common drying element of the apparatus. As well understood in the art, the drying element comprises a series of drying rolls which are diagrammatically indicated in Fig. 2 of the drawings by reference character 22. From the drying element, the two webs of paper pass to independent calenders 23 and '24. Thus, it will 29 and a rewinder 30 are operatively associated with the calender 24. The winders and slitters may be of the usual type.

From the foregoing description, it will be understood that two webs of pa er are simultaneously formed in the forming instrumentalities A and B. After expressing an appropriate amount of moisture from each of these pulp webs, the two webs of pulp are conducted together through the drying element C of the duplex apparatus. In this manner, the capacit of the drying element is substantially oubled, since two sheets or webs of pulp are simultaneously dried in the drying element C. After passing through the dr in element C, the two sheets or webs of rie pulp are passed to independent calenders and subsequently to independent winders, slitters, and rewinders. In this manner, a common drying ele ment is employed in combination with two independent instrumentalities for forming webs of pulp from appropriate paper pulp stock. Thus, in accordance with the arrangement of the invention, two sheets of paper are simultaneously formed and run through the duplex machine and over the common driers at the same time, the two sheets separating at the end of the common drier and running through separate calenders and suitable finishing devices. Such an arrangement is very economical in operation, since it enables a material decrease in the amount of capital investment, and results in increased production without a dis proportionate increase in the amount of additional machinery required.

Having thus described my invention, what I claim is:

In a paper making apparatus, the combination of a plurality of web forming mechanisms, each provided with a plurality of forming cylinders, said cylinders co-operating with one another to form an integral wet paper web on a felt common to them all; each forming mechanism having means including pressers to reduce the moisture occupied by the entire apparatus and having their dry ends adjacenta single set of drying cylinders over whic the webs of paper from each of said forming mechanisms travel together; said pressing means being adjusted to remove sulficient moisture from said webs to prevent sticking together when passing over the drying cylinders; and means beyond said drying cylinders for separating and for separately calendering and winding the resultant paper webs.

In testimony whereof I aflix my signature.

CHARLES G. ROBINSON.

Certificate of Correction.

It is hereby certified that in Letters Patent No. 1,503,246, ranted July 29, 1924, upon the application of Charles G. Robinson, of Buffalo, bfiaw York, for an imrovement in Paper-Making Apparatus," an error appears in the printed specication requiring correction as follows: Page 1, line 45, strike out the word simultaneously and insert the same to follow after the word element in line 44; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Oflice.

Signed and sealed this 2d day of September, A. D. 1924.

[emu] KARL FENNIN G,

Acting Uommz'asiomrof Patents. 

